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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b67d7a71f9c1067bdb3078ebd1a2f65038cb57b01be23418efbcf4b178299da' 
  AND token = '7hWlbh7Vpqofp0sPeXm2Oh0tF/97T8aXEwBEh322U/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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