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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136368df62a0c437e460cbe4452d657b217d5527c15b90451a0cca42aea85cd7' 
  AND token = '2Qends2Lzbf0RfBJ0JwBYjDRQVnLeZzmfYAgSehonao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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