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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61dddc807f741acf765a931fac75e111c5defa56c332b10b8e7ce1450e4f904' 
  AND token = 'SWpFLOrXHAU0w0MlWmuEzoxKJ5JxOBNcOWQRgVIwaZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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