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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20807c15e0eb0ccae5d05e04a035ad9af251452f0106e5c1c30083a042e7d6de' 
  AND token = 'UCT2UUhOFLjsYvBgOuH+2gddj2yVu6p879xwnqFisR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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