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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8a73dd2c1c82c1667268697b3da0d4a258a8e29f85c7e073f7799267478309' 
  AND token = '7SzDZinwe57fpib4tuCri/eWyKGWfB1YVJMgdbzgkUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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