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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c6a0865a7eacca088a8520a2b40ad528046333cf68dc43e6edb73c9dc8a7d9' 
  AND token = 'y4ngZSSb5UdnWaOoirJS4KgAXM0mUwbFX6D8tTQBtnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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