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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a19f4f10a18b434b8ea967d54b624a92ba9605e30dcf994bb975badf4e6648' 
  AND token = 'cG50ifn929ah33d8geZueSsMjqJ0Zt9a17rdW13lQlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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