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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8813aa69ed121f9e93bef03f64b1c0ea3c5dbf33af32aa0e2d7677db2503fc' 
  AND token = 'nB2vebjnSJzAR0wtzB9XYe5EIdge9gbVQWj8qqH7xnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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