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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7c497768dccff359ca5d27e0a94c58430167dd59aa2d49d53ab91a4a826bff' 
  AND token = '5K+U7N8wtOqVxVrWCfd40LJMyXszrQpuK20RQn7o5zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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