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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4954ff091429d5031b4a8a430af4ce3f9d5b6589e8768f9d13ced062ab0626' 
  AND token = 'uBTABPQX8fpuefRwPuxKphBbGnd6Wi3wh+0ecjvvIsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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