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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8dcf2331fbf28119ca49414ebb7a6359796b8f97efe0a4caf846fa45b83f93' 
  AND token = 'TizkDydahsD0LMx7ZwBc6Xr7K/JeaKmu4qJwUteZdbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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