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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9f8fbf100fa48b6bd23d0c8a4afed52c4efb7f7849d532e2b2b32b8fc93b38' 
  AND token = 'DagyjiFKiHdRgCsm6ZQ3RtIcd6IU1S63F71l0lKK3Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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