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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3d00750272a6e8daba9f3c3c740263a69ae94e9e3f33b9b9dc915e5259b06f' 
  AND token = 'oiAgqDoaZs+aP8xAgjxkQREheXiyQfrJbvaIc7FM/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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