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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28dd6dd88455d14027343c65eb126f16ecd23299ebd14400810732e1542d0306' 
  AND token = 'xWhb49IKSZ2MfQnie11Zd2McUJDYSzDTHb1rkKeykfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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