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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d981e51f71995136cc6ce0e417a317e5dd5318273699081e5fdb289344880c' 
  AND token = 'ly059F1phqj6T5gx5Q5xDMWK0vn0yPcdrYZc/f1MubA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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