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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1b37963909f4ae27a9abcf9006c5f13f7dba04a6cc91de0af1a7d26534fa5d' 
  AND token = 'pXhU6++VWlsEDetYc2uIe46zIXwHDwqkpFfh5FNEXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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