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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797a42ce8152f2ba9424f8f3528f1138d343c86a838e5ac47147eea285810ec1' 
  AND token = 'Fs37dVAxOSBOkncWCuEHp+6hqIUvDaecGw72pa6Mgtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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