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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc04ec0c78e978df4946894f6bc56401c8b7f2e93e682fa9b75988de87d51e12' 
  AND token = 'uIVO8b7gGWdx9YaVCim9j3RzhccD4UyHJG/64ENUHsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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