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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d15a26acaf46cf99956c14a9be24eb2b5fc6872c3edcc211e20e07c6eb5600' 
  AND token = 'rCC86oY2E3K60oeb+L02IbG74EMUK7HdUW3JlT39yYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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