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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cef7d04ebce04ced0fc943dc122a603be071641c0ae17d875ae9c7a7ea007d' 
  AND token = 'rBOkHsM0JU6+WSKcA38ZgwWojKj0iLQZI5JN9bRaM5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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