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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39901238c84814cf01b609c0adec231c901f11c8c594ec1ee9960dd93131348' 
  AND token = 'cyttqRxeMoL1CG49Yd33qxt0Dy6XeIYqIeM6eoO9WDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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