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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ebb8674eee999d73b164962ee401c819111aa246d8c061932b8f9ea227fb7d' 
  AND token = 'BGitAPPxSbHtbV6tePnWgTI6V6CdByZU9Xqapm9U6M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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