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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a94222eee63b6ce8a59ea99d408917102e5e5ab431b2c50a3ea23f816ae90c' 
  AND token = 'fMr8YJb1Po8rvYmcj5sJIkdLO1FLx5gDBH3iEQd+nZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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