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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b8db9419d04b1e0b9166ce03d4f92b5effebc746fd13bee0963a23fca86615' 
  AND token = 'Y6J3LvuvMhvq2su5lyAo6Fyab7Sz7sk5QK5QCV+Rovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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