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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3042551c9d71b7f0a9e46b3d96cd3bea37fa5fb36c2c4a32d21b501f08f13f73' 
  AND token = 'UQLJ3ms3eVBpL2Iq1aI3ZC2KTsrKHJclP0A7k8NyQig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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