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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb3473691b27cf31bc96aa34836d34edfb69a211a7b04691565aab10e7a42f9' 
  AND token = '2pTgGKgVmaNgnqzYX02SMa+T2bJZUs+XV4oq9N3xL4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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