SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c282a8dbb6d37290a9947c1bc8f9a3b660308e3b65b5351a11721cf467c6b0f' 
  AND token = 't7TDjViT4AuMFIzNwq7JU27JgGfVV/yJka3vVbKYpo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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