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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9005c80d276befd2e150c9f8389f9b50223ab3ef1abf50d695340f963cd439f' 
  AND token = 'XnFN2MpG+miADoU8xdIHw1wKH3hoprw2XMPrrqGgIo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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