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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5ffe09a55fd28dcbfdde05622412192eeef80f9b8cfdf0e4fa0cbae8fed6a8' 
  AND token = 'YkXp7uxezTgSXxBNkKaVnjkRTWAKxpbe4BUESckUuHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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