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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a84963021d43f63ddc7dee3794dfffe0430af0f9a03549259677a5c09b72144' 
  AND token = 'gPO4zG2czGa7E2uRkO/XN/AekXzs11tgpVJFHUJo2WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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