SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055bc2fea3e5986bf3361533ba04e93942415fed7d9919f4c40bfe5f8f58d582' 
  AND token = 'HVwBkVMI93xVHGX4NaXjKr1D2OiWZ/SlzPJm1xACqOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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