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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89577d2eb64c5f52a850296ec1ed15d124237a8f1c1ce9a8534a61a367c417bd' 
  AND token = 'FsUE+Va6JhbZ0BdLYZo6l+28+MnwMSw7cG3b1lOSPjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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