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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c7c96e5d9ce18ec685ef5113b25f8357d9b1835b711b9518a99c74e78ed5c1' 
  AND token = 'G5OhGXJNrKcBt3jP9FYRQs6sokb0b41bNe0eOkkXAYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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