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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cb7876bda87eb21f0141dfbf6b6409f9ab432059b2e9728582717467c3e26f' 
  AND token = '9Te1Bir56zJz6SUT4nGZLTXf/1dnvcBTXO8q9nIwZYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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