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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84be3ffd73a3417ec63ea9e5cc1222f450be208c8cfb6dee443671939712bc7' 
  AND token = 'DcYS/udh+fPSIwnCZ1ZmwiZoggrJmc2loLJYRR34+4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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