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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ea99037f914657dc5afcd664ebc3706eae432c9e5e4d506432fe41f58bf565' 
  AND token = 'OH7Ve+DTtk0XPe0YjqwIa1Op/AfbLL4VJ6VlSKWsNuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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