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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ab9114d918ad74945ccd6d12272974e6cef8afd33e63a7be6087f363a6b8ad' 
  AND token = 'YdOCEJNnSbyxPnFsszfSryiHYJSapzLgSySfPk+St1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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