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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2829d2459a92b6740db100fd0a2a265086fd2025e2114c867884a3769673b07c' 
  AND token = 'RnHwu3pNPp0QpeXLTtUIQM0gtBgBK8GyDb5L9mMBNvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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