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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b032439fd37823c157d04fd972816494f7ebd7ce90d171e05f91f5ee33b917' 
  AND token = '4htbjK2CJusKoTFM8y4cj4frzNycqqp3ZwfAR8wnd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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