SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f2c730c1bb7fdfce3274df094c8a6a205f8079979ec237e1270b651db3e385' 
  AND token = 'h1mFui+M9qPCHd9djjJ9DApDxNHKKEIEQSjhlGZqWLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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