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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84074c0bbb00d31d9cd3e828d4c992ed050600cc16ca69df7dd6d28e5069a8fd' 
  AND token = 'innXuBpcUZVPKGp696K+WKOFC6eIoUaGzeA9S+mhw24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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