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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6716f893b87d4aa9100dd861376afedfe92bbf1c90ad204162cf37f7e267a5b0' 
  AND token = '57E5sJuefsQ7SD0UBugO5zc08m+Na63276sw3K/C5iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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