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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f408cda7ad6fcbc772759d822acf8200be2014faf6bac2e59178755fb38772' 
  AND token = 'virpOH22Mj0vaSK446eob8A8vouOl1vJjMtk+xAzaZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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