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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd2a6aade207de41976736da48fe95c4470660bebba0b8613941705eaedb899' 
  AND token = 'SsiK8mwKw/eXkUcBMr49XZCHWXwLjyPjZPL5AM21PVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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