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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcb6a083baa4f548f12ab412a6ac354e2b030cfd77e1505d1ef74baf4cd214e' 
  AND token = '13k1A9O6zxFamMlJ3YY3tXvH+Xk4I/OJPyNwfMqZKtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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