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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d295914451c071407b5d61b7bea9a33ab4278f0399757b3c584537488adf47' 
  AND token = '2hTqYM9zXN/hy0DcFiYpeft5azW5hLPdwkfuN1e5WgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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