SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c770ac2eb222afd88864ed05c668bbc8793bf3652d7ecb31ad5565486440179' 
  AND token = 'aPIlZ7tOdQxgBxJGfyOVrXcKYB6XPzU1D6D2E1w5GnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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