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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf835be35b3889a994e4a3b998dd083b0c97945779aca48b5cceb401d530d78' 
  AND token = 'ztJtmb7Y5eFfpxGZkJUqf/Pmfs7oYMvyQPI9smc30K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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