Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6731d4a906df22cc91dbd78e0a2dec81f63d67ecdb80da94c8715d7acedbcad3' 
  AND token = 'm1njUp765sSoFb/DnTEBSPbN58BTsUV78JNdMPtc5g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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