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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec6eb6a25a3543e3515df8d1f6c5ef5aa0452b1605379ef2535f7ed4d0dea5a' 
  AND token = 'oPpJRYF/gTCnULiHSYJFUWybpXlg7FkenlmmCFy0fxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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