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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd508cedf81f890afaf9d73e989d2163c8c42f877ba612d9f013ffe9af3e34452' 
  AND token = 'sAkG12uHMVsiBd5DJzeugbSaeTLuPwEZ09OsQq2JKDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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