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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d7573e16c426e6ff7ea6be7c6b26539cf911556ba35beae6c26f651eb4958a' 
  AND token = '1S0zvREqjKJcbk2c9oRdzSexSTEMICHdGQFnmHmelfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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