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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfdb872e08389641404b48ddb2008ba1cf75dea40e9d92a0b4a0563ee38f223' 
  AND token = 'AiAYaS5hE72lSmv3SJzCoGa7sU/caqhhSxdaei7n2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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