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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4394a834b18b4722c27197c44dec09473969383a620e6ac71a649b239b00734a' 
  AND token = '6ezzZPTvS9QQZuZrOpkhuvSe8aOP3+NT5EYodhbcmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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