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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052843b4e70791eab588b456c8a98ecdb42dc4541b1496bd6476ee306b024082' 
  AND token = 'ecghEUNzry93eZv7gkP6bDEgh2bHuOpJoKh6Rppw/xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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