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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8089a55a32c79b056b8c33af9ddff3c250375e4ad1cae08287ef69703b419830' 
  AND token = 'neAJis/eddP6Hbbe0gw7EmmKcuC+6XXdW4XWGNTXEKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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