SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ffe936fc7d61b6bb4b89494b3d4929d7cb05b8bc736d038f6b83cbbf059cf5' 
  AND token = 'gDBteVVvwcIFv/feqrXfoMRtGzP0mVaZqu7v7nsC+JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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