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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c72715f2055160a2801f3e75bc0d4e8317ddf4dfe69b6601a87542208c717bd' 
  AND token = 'LzNXi6Im2E85RqaNEys3xHUWWOVYvC+di9QBJceh44Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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