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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a352d32c84f4d06fcd302c27aa1379e13631fe2c60d687f45eb28a0d30d6728' 
  AND token = 'VkG0gm2qY316cpBwUbhSXS3w9niJ3F+z57Ipm3vEGww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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