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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23e89c1f70358de524bac18f7bfce1863197dbc88ff3b42a6c94082915be337' 
  AND token = 'ZySToAzwOCdgBJPZj3DoFBroWpcsBqw1CSxdJ8GW4BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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