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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ba82377bafd8a2ece2b836cc65982c70b5818f84335df4bf0ca8c6c464d629' 
  AND token = '8ZdVzoif9cinJGIKt83cJDqql8Ko9pzpwJykDO+MlBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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