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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389e6974516b2d31f0dfc9b779ab23f668103ad51153c162fb7a6e85c96ffe58' 
  AND token = 'qDBdgPYLYE9kDG/tghld73NaYt3U3hmCe+0GKeUfLK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}