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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b66a5ad4346fce0131943204e5fbd6e03acbb803f602c9e1fafcb71f3cfd70e' 
  AND token = '2rsLlXrWW26XUl+tIVD56iU6/vJTuLvH63/L4Nmqwh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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