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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3098bf3a6225000dd6019528c7eb6fc4bb3635054ef705d246cd6a10aa08858f' 
  AND token = '9MFlcMKHwKr0UiNU+YqhvfEWezif3N3TEyPz8rpsKd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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