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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8cc9ad64f58f8b00b1875315d576a6fc0cd67981fa8f16a58641700a120a46' 
  AND token = 'L6sroy+18XJTOnJeu225O0VyLgDfn1BF9uIXtp9jjtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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