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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffad5d14dc490d78b85c2ef93809d10dc6a98a5e5992441ad1568d2b6776eba5' 
  AND token = 'tKdWCPWUQTkgq0uEC6XO2qwUTDuJUEKCkx8vohqMuu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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