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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcff7e958f9830336ed83882e6f5d146e42179ead884ec777455c0037e67c7d' 
  AND token = '8kDag3+o6asjlpOaq073TWoXX8XqTWe3+gRQHb624i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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