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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169e3eeb5ac279d7e476b9f009adb13ebc58fb91e5b891049a5dba7374bc49d4' 
  AND token = 'erZpDVmCoSoWDHax7AhA9ZWn+YMJFSJBzGSuNip63FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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