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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648de32ec18a29755eff3260469f7426710e9c53480cd927ef3734b4698c40da' 
  AND token = '337xKfHu8GSXLfnOnvsJbhC9wfr4OP84/o+WYTwW1h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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