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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4f22620ea1f3c1751be258ef90ba37b756862026d81168429e87ed8ac14984' 
  AND token = 'IXt9TmwPFn59YX04WZRRbJgNVN8YoqDniaoVC97RY58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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